584 THE FUNGI WHICH CAUSE PLANT DISEASE 



Conidia densely spirally spicate at 



apices 12. Clonostachys. 



Conidia on small stalks 13. Sceptromyces. 



Conidia in chains 14. Spicaria, p. 585. 



VerticilUum Nees (p. 583) 



Hyphae creeping; conidiophores erect, verticellately branched; 

 conidia borne singly at the apex of the branchlets, globose-ovoid, 

 hyaline or light colored. 



A genus of some seventy-five species, which are in the main 

 conidia of various species of Hypocreales. See p. 196. 



V. albo-atrum McA. is a weak wound parasite of the potato. 



Verticilliopsis Cast (p. 583) 



Fertile hyphse with verticillate branches, 2 or 3 at each node; 

 fertile branches clavate; conidia in heads, surrounded by a slime. 

 A monotjrpic genus. 



V. infestans Cast, infects mushrooms in culture. 



Corymbomyces Appel & Strunk (p. 583) 



Sterile hjrphae creeping; fertile hyphaa erect, septate, dichoto- 

 mous corymbose; conidia ellipsoid, clustered in gelatinous masses 

 at the apex of the branches. 



A single species, C. albus Appel & Strunk. on cacao in Africa. 



Acrostalagmus Corda (p. 583) 



Hyphae creeping; conidio- 

 phores erect, septate, richly 

 verticillately branched; conidia 

 borne in slimy heads on the 

 enlarged end of the secondary 

 branches. 



About fifteen species. 



Fig. 390.— Cross-section of a vascular ^' ^^US Preu. 



v^eu; Af™^^olk!"^'"^ " ^^ ^yP^® cespitose, effuse, slen- 

 der, subangular, continuous or 

 septate, conidiophores, 200-220 x 1.7-2 m, erect; fertile branches 

 continuous, straight or curved; conidia in spherical heads, &-10 n 



